Question

If a man walks around a circle 2.125 times, how many metres did he walk if the radius of the circle is 4m?

Answer 1

help please

Answer 2

Hello! Welcome to OpenStudy! Do you still need help?

Answer 3

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Answer 4

Now he walks around a circle meaning the circumfrence now to find the circufrence we would use this equation...\[C=\pi d\] or \[C = \pi r \times 2\]

Answer 5

Now we know of the radius which is 4 so to find the diameter we would multiply it by 2 so it can equal the entire length of the diameter.... so whats the diameter?

Answer 6

8

Answer 7

circumference is 25.12

Answer 8

Correct! Now we know of the circumfrence! Now he circles it 2.125 times so we simply multiply the total by 2.125....
\[25.12 \times 2.125\]

Answer 9

53.38 ok

Answer 10

thank you

Answer 11

Yup! So the total of meters is 53.38 m^2 xD

Answer 12

Your Welcome! xD

Answer 13

i have another question if you have time to help me.

Answer 14

I can help xD

Answer 15

tyty

Answer 16

can i ask here?

Answer 17

sure :D

Answer 18

If a ball travels around a circle of radius 4m in 1.5 minutes, what is the angular speed of the ball?

Answer 19

Hmmm this one is a little hard....

Lets see....

Lets first convert 1.5 minute into seconds.... so there are 60 seconds in one minute and half of a minute is 30 seconds so the total of seconds would be 90.....

Now since a whole circle is 2pi radians it would be 2/pi radians .... now I believe we then create a fraction which is setup like this...
\[\frac{ 2 \pi }{ 90 }rad/s\]

we do this since we want to know what the speed is so we simplify the fraction .... what do you think would be the simplification?

Answer 20

\[\frac{ \pi }{ 45 }\]

Answer 21

ty

Answer 22

Thats what I got as well xD Great Job!

Answer 23

Im glad I helpful but I must go....byeee xD

Answer 24

bye thanks a lot